Cleanup of system settings constants (ab)use.

chrome/browser/chromeos/login/hwid_checker.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/login/hwid_checker.h"
 
 #include <cstdio>
 
 #include "base/chromeos/chromeos_version.h"
 #include "base/command_line.h"
@@ skipping 73 matching lines @@
 #endif
   CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   if (cmd_line->HasSwitch(::switches::kTestType) ||
       cmd_line->HasSwitch(chromeos::switches::kSkipHWIDCheck))
     return true;
   if (!base::chromeos::IsRunningOnChromeOS())
     return true;
   std::string hwid;
   chromeos::system::StatisticsProvider* stats =
       chromeos::system::StatisticsProvider::GetInstance();
-  if (!stats->GetMachineStatistic("hardware_class", &hwid)) {
+  if (!stats->GetMachineStatistic(chromeos::system::kHardwareClass, &hwid)) {
     LOG(ERROR) << "Couldn't get machine statistic 'hardware_class'.";
     return false;
   }
   if (!chromeos::IsHWIDCorrect(hwid)) {
     LOG(ERROR) << "Machine has malformed HWID '" << hwid << "'.";
     return false;
   }
   return true;
 }
 
 } // namespace chromeos